I’m trying to use the cassandra-stress tool for the first time today. Although I'm able to run the tool, a lot of "Failed to connect over JMX; not collecting these stats" messages are displayed in the ...

I have decision to make regarding a data model in Cassandra. I have large amount of web analytics data, in the form of mouse event data, where each row in my column family is a mouse event. Currently ...

I am trying to connect Opscenter with the cassandra cluster. I am using a seperate storage for opscenter. I can see both Opscenterd and cassandra services are running. But I am finding these errors ...

I am using DSE 4.6.1 and seeing a delay in the log when trying to query a column family using Hector API. The keyspace being used is empty as it is for testing. Replication factor is set to one and ...

OpsCenter version: 5.1.0 and
DSE Version: 4.6.0
Creating a brand new cluster by using OpsCenter directly, gives us the following error. It randomly works with the same settings but 95% of the times ...

I am having a cassandra ring across two datacenters, below is the key space definition. when I trying to bring all the nodes of the local datacenter (aws), I am expecting the the datastax driver to ...

I am trying to perform search result aggregation (count and sum) grouping by several fields in a nested fashion.
For example, with the schema shown at the end of this post, I'd like to be able to get ...

cassandra is generating jumbo frames and our MTU was set to default i.e 1500. So, the packets are getting blocked by the network devices and the send Q is increasing. Is there a way to stop cassandra ...

Using OpsCenter 5.1.0 and trying to add S3 as a location for snapshot backups. What are the necessary permissions in AWS IAM for the opscenter user? So far, I have the following policy:
"Statement": ...

Since last week we are seeing lot of pending tasks increased in cassandra. I know there are just the WARN messages but all of my logs are flooding with these messages on all the nodes in the cluster. ...

I am testing our write performance with our cassandra database model. I have deployed a 5-node m3.xlarge datastax hvm cluster. I am using a flask restful API in conjunction with the cqlengine. In a ...

I am trying to use DataStax Enterprise 4.6 to write a Spark application in Java and run
it in DSE's Spark analytics mode.
The code for creating a Spark context using DSEConfHelper:
SparkConf conf = ...

There seem to be multiple plugins written for monitoring cluster nodes with Nagios, however I run into the same problem with each one.
Basically, if I run the plugin script locally from the Cassandra ...

We are seeing lot of hints timing out and I don't see any thing is logs about nodes are going DOWN. This is strange to me why cassandra is building up the hints table if it does not think it is down. ...

I have 4 node cluster in datastax 4.6 with 2 spark ,1 solr and 1 cassnadra node.
I am facing issue when i am executing sql query on spark with hive context.
Issue:
When i have 5-10 table in cassandra ...

We have issues currently with our cluster and it has been recommended that we don't run OpsCenter until we add some more nodes/scale up our current environment. That said, we obviously can't run the ...

So we've been having trouble balancing our workload on our current cluster, due mainly to budgetary constraints and the inability to add more nodes at this time. Up until recently, having a node go ...

In my node application, i am using following code to run some query. I want to call callback function after (arraySize > 100) and exit. Currently i can only exit after all processing is complete.
var ...

I've been having these issues for quite a while already but I ignored them initially because I can still start my nodes. However, one of these issues became more serious recently that it now takes me ...

I'm running Datastax Enterprise in a cluster consisting of 3 nodes. They are all running under the same hardware: 2 Core Intel Xeon 2.2 Ghz, 7 GB RAM, 4 TB Raid-0
This should be enough for running a ...

We have a staging environment which runs a one node cluster completely separate from our production environment. What I'd like to do is copy this one node cluster over to a test machine that I have ...